[dns-operations] check if a domain has been registered via DNS

John Levine johnl at taugh.com
Thu Apr 27 14:03:02 UTC 2017

In article <3358ae00-e21d-92b3-19df-dd3fa527c9c4 at vodafonemail.de> you write:
>if rcode is NXDOMAIN then domain not taken. if rcode is NOERROR then 
>domain has taken.

If the domain exists in the DNS, it's in use, but if the domain
doesn't exist in the DNS, it may be available or it may not.  There
are many states that aren't available but don't publish NS records.


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